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update signature variable names

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This commit is contained in:
Andy Eschbacher 2016-10-06 09:53:38 -04:00
parent c7f5c24510
commit da1449331c
1 changed files with 10 additions and 10 deletions
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20
src/pg/sql/18_outliers.sql
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@ -1,12 +1,12 @@
-- Find outliers using a static threshold
--
CREATE OR REPLACE FUNCTION CDB_StaticOutlier(attr numeric, threshold numeric)
CREATE OR REPLACE FUNCTION CDB_StaticOutlier(column_value numeric, threshold numeric)
RETURNS boolean
AS $$
BEGIN
RETURN attr > threshold;
RETURN column_value > threshold;
END;
$$ LANGUAGE plpgsql;
@ -15,7 +15,7 @@ $$ LANGUAGE plpgsql;
-- TODO: add symmetric option? `is_symmetric boolean DEFAULT false`
CREATE OR REPLACE FUNCTION CDB_PercentOutlier(column_values numeric[], outlier_fraction numeric, ids int[])
RETURNS TABLE(outlier boolean, rowid int)
RETURNS TABLE(is_outlier boolean, rowid int)
AS $$
DECLARE
avg_val numeric;
@ -34,7 +34,7 @@ BEGIN
FROM unnest(column_values) As x(i);
RETURN QUERY
SELECT unnest(out_vals) As outlier,
SELECT unnest(out_vals) As is_outlier,
unnest(ids) As rowid;
END;
@ -42,8 +42,8 @@ $$ LANGUAGE plpgsql;
-- Find outliers above a given number of standard deviations from the mean
CREATE OR REPLACE FUNCTION CDB_StdDevOutlier(attrs numeric[], num_deviations numeric, ids int[], is_symmetric boolean DEFAULT true)
RETURNS TABLE(outlier boolean, rowid int)
CREATE OR REPLACE FUNCTION CDB_StdDevOutlier(column_values numeric[], num_deviations numeric, ids int[], is_symmetric boolean DEFAULT true)
RETURNS TABLE(is_outlier boolean, rowid int)
AS $$
DECLARE
stddev_val numeric;
@ -52,7 +52,7 @@ DECLARE
BEGIN
SELECT stddev(i), avg(i) INTO stddev_val, avg_val
FROM unnest(attrs) As x(i);
FROM unnest(column_values) As x(i);
IF stddev_val = 0 THEN
RAISE EXCEPTION 'Standard deviation of input data is zero';
@ -61,15 +61,15 @@ BEGIN
IF is_symmetric THEN
SELECT array_agg(
abs(i - avg_val) / stddev_val > num_deviations) INTO out_vals
FROM unnest(attrs) As x(i);
FROM unnest(column_values) As x(i);
ELSE
SELECT array_agg(
(i - avg_val) / stddev_val > num_deviations) INTO out_vals
FROM unnest(attrs) As x(i);
FROM unnest(column_values) As x(i);
END IF;
RETURN QUERY
SELECT unnest(out_vals) As outlier,
SELECT unnest(out_vals) As is_outlier,
unnest(ids) As rowid;
END;
$$ LANGUAGE plpgsql;